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The antigenic reactions of 35 strains of four pathovars of Pseudomonas syringae (Ps. syr. aptata, Ps. syr. tabaci, Ps. syr. mors‐prunorum and Ps. syr. phaseolicola ) were studied by double diffusion and indirect immunofluorescent staining, and anti‐whole‐cell and anti‐LPS‐extract sera. It had already been shown that the precipitating lines in Ouchterlony double‐diffusion tests, due to bacterial LPS, were suitable for the distinction of O‐serogroups. The investigation of serological cross‐reactions between the 35 strains and 20 antisera revealed that three pathovars were serologically homogeneous: Ps. syr. aptata, Ps. syr. tabaci and Ps. syr. phaseolicola. They could fit into three O‐serogroups formerly described: namely APTPIS, TAB and PHA. The O‐serogroups APTPIS and TAB showed some common antigens. The 10 strains of Ps. syr. mors‐prunorum studied were distributed into two O‐serogroups (eight strains belonging to the O‐serogroup MOP1, one strain to MOP2, and the last strain failed to react with any of the serogroups).
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Guillorit et al. (1993) studied this question.
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